   #include<stdio.h>
   
   #include "mymath.h"
   #include "mystdio.h"
   
   int main()
  
   
   {
 int ret = myAdd(10,20);
   printf("%d+%d=%d\n",10,20,ret);
  
    myFILE* fp = my_fopen("log.txt","w");
    if(fp == NULL) return 1;                                                                                              
 return 0;                                                                                         
 } 
